Evolve your mutant giraffe by absorbing the bodies of other giraffes. Do this by tapping on another giraffe to knock it out, then tap it again to absorb it. Each absorbed giraffe is worth three experience points. Your giraffe will evolve when its experience points meter is full. To evolve efficiently, leave three to four other giraffes alive. This will make new giraffes spawn faster. If you absorb all available giraffes you will have to wait up to two minutes for more to appear. There is a maximum of ten giraffes that can occupy the screen at one time, and that limit is reached after the game is idle between five and ten minutes.